Why should you not change Facebook content?

Im working with CB-Nutra offer, it works well with FB traffic but with only some old content, when I try to use new idea, it works pretty bad and I realized that it should not be changed (posts, lookalike files, and pixels).
do you agree?

when you pixel have good purchase,you can have good result,then content not important

FB Agency Partner said:

when you pixel have good purchase,you can have good result,then content not important

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yeah,,i agree.Have you use LLA FB?